A penta is not a shape - it is a prefix meaning five.
The answer will be different depending on whether you mean a pentagon (5-sided plane figure) or a pentagram (5-pointed star) or a pentahedron (a triangular prism or a quadrilateral pyramid).
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A pentagon has five sides and angles, and an octagon has eight sides and angles. Together this adds up to a total of 13 angles. One trick to remember how many angles and sides a polygon has is to look at the Latin roots. For example penta- is a prefix meaning five and octa- is a prefix signifying eight.
A pentagon has 5 sides.
saying the question is how many sides on a pentagon, there are 5 sides on a pentagon. (the prefix "penta" means 5)
A pentagon has 5 sides. Penta in latin means 5.
A polygon has as many angles as sides, so a polygon with 10 sides (decagon) would have 10 angles.